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(-No Model.) 2 Sheets-Sheet 1.

A. S. MARTIN.

GRINDING MILL.

No. 390,497. Patented Oct. 2, 1888.

ALFRED SABEN MARTIN, OF FORT VALLEY, GEORGIA, ASSIGNOR OE ONE- HALF TO `WALTER H. SAWYER, OF SAME PLAGE.

SPECIFICATION forming part of Letters Patent No. 390.497, dated October 2, 1888. Application filed January S, 1887. Renewed June 25, 1888. Serial No. 273,209. (No model.)

To @ZZ whom it may concern:

Be it known that I, ALFRED SABEN MARTIN, a citizen of the United States,and a resident of Fort Valley,in the county of Houston and State of Georgia, haveinvented certain new and useful Improvements in Grinding-Mills; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to 1o which it appertains to make and use the same, reference bei ng had to the accompanying drawings, which form a part of this specification, and in which- Figure 1 is a side view of my improved grinding-mill. Eig. 2 is an end View of the same. Fig. 3 is a longitudinal vertical sec tional View. Fig. 4 is a transverse sectional View. F1g..5 1s a top view showing the lines :c a: and y y, on which the two sectional views, 2o respectively, are taken. Fig. 6 is a perspective view of the grinding-disk with one cutter or grinding-block removed, and Figs. 7 and 8 are detail views of the grinding-block and one of the stationary disks.

Similarl numerals of reference indicate corresponding parts in .all the figures.

My invention has relation to that class of grinding-mills in which a revolving grindingdisk having a horizontal shaft is j ournaled between two stationary disks, the said disks having grinding blocks or cutters inserted in their faces; and it consists in the improved construction of the disk and grinding-blocks of such a mill, as will he hereinafter more fully described and claimed.

In the accompanying drawings, which show a complete mill, to more clearly illustrate the application and workings of the parts referred to above and claimed as my invention, the

4o numerals l indicate the four supporting-legs of the frame, which legs are connected by means of sidetpieces, 2, and end pieces, 3, and at their upper ends by means of a hopper, L1, having the end pieces, 5, inclined toward the middle.

A shaft, 6, is journalcd transverse] y in bearings 7 upon the side pieccs,and the drive-pulley 8,to which the power is applied,is secured upon one end of the shaft, a smaller pulley,9,

5o being secured upon the shaft inside of the drive-pulley.

The revolving grinding-disk 10 is secured upon the middle of the shaft, and is thinner at its periphery than at its center, and is provided with radiating slots 12, extending from the periphery to near the shaft, blocks 11 being formed at the inner ends of the slots.

Recesses 13 are formed in the periphery of the disk at the outer ends of the slots, and grinding-blocks 14 fit in the slots, having notches l5 in their inner ends, and having beveled side edges, 16, which project outside of the face of the disk, forming cutters or grinding-ribs, and lips 17 at the outer ends of the blocks fitting into the recesses in the periphery of the disk.

Two stationary segmental disks, 18, are supported at the sides of the grinding-disk, having removable grinding-blocks 19 in their inwardly-inclined faces, about one-third of said disks being cut away, leaving about one-third of the revolvinggrinding-disk uncovered. The stationary disks are provided with longitudinal bars 20,projecting to both ends of the supportingframe, and the ends of these bars are perforated and lit with the said perforations upon screw-threaded bolts 21, secured horizontally in the legs of the frame and projecting transversely from the same, and nuts 22 fit upon these bolts and serve to adjust the bars thereon, drawing the disks nearer to or farther away from the faces of the grindingdisk.

The hopper is formed with a casting, 23, covering' the aperture in the lower end of the hopper, and this casting is formed with two longitudinal slots or apertures, 24:, which reg ister with the faces of the grindingdisk, so that any grain or seed fed through them will drop between the revolving grinding disk or runner and the stationary disks.

A shaft, 25, is journaled transversely in the hopper, and is provided with downwardlyprojecting radiating stirrer-ngers 26, projecting toward and into the slots in the casting, and one end of the shaft is provided with a crank, 27, to which is pivoted a connectingrod, 28, pivoted to the face of a pulley, 29, journaled upon a stuhaxle upon the side of the frame, and having abelt,30, passing around itand around the smaller pulley upon the grinding-shaft. It will thus be seen that when the IOO driving-shaft is revolved the runner or grinding-disk will be revolved and the grain or seed which may be fed between the disks will be crushed and cut by the beveled ribs formed upon the faces of the disks by the grindingblocks, the ribs of the revolving disk being faced in a direction opposite to the ribs of the stationary disks, so as to bring the edges to face each other.

By having the grinding-blocks removable the edges may be sharpened, and the blocks may be removed and others substituted when the blocks become so much worn that they cannot be sharpened any more, and by the shape of the blocks in the revolving disks the said blocks need no fastening, but will be perfectly held in placein their slots by the notehedinner ends fitting upon the blocks and by the lips resting in the recesses in the periphery of the disk. As the grinding-shaft revolves, the pulley 29 upon the frame will be slowlyrevolved and will impart arocking movement to theshaft having the stirringingers, which will serve to force the grain or seed into the slots or apertures in the hopper, the machine being thus enabled to grind any grain or seed regardless of its tendencies to stick together and form lumps, enabling the machine to grind cotton-seed.

By turning the adjustingnuts upon the bolts the stationary disks may be moved toward or from the revolving disk, regulating the degree of iineness to which the grain or seed is to be ground.

The disks are preferably covered with ahood or casing, which prevents the grain or seed from flying out from the disks, and thus be wasted bel'ore being perfectly ground. The lower portions of the stationary disks are held adjusted by means of bolts 32 passing through the side pieces of the supporting-frame, and having nuts 33 upon them, by means of which they may be drawn in or out, as desired.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States- In a grinding-machine, the combination of a grinding disk thinner at its periphery than at its center, and having radiating slots eX- `tending from the periphery to near the center, having recesses at the outer ends, and having blocks in the inner ends with grinding-blocks fitting in the slots, and having notches in their inner ends fitting upon the blocks in the ends of the slots, and having lips at the outer ends fitting in the recesses and formed with beveled side edges, having their sharp edges projecting above the faces of the disk, as and for the purpose shown and set forth.

In testimony that I claim the foregoing as my own I have hereunto afxed my signature in presence of two witnesses.

ALFRED SABEN MARTIN.

Witnesses:

SEWALL ALBI-3T DAY, MARTIN J. TrroMrsoN. 

